The Mastic Doctor team standing beside their branded vans outside an office building
Greater London · England

Commercial washroom and wet-area sealing in Forest Hill, Greater London

Looking for washroom sealing in Forest Hill? It’s simple: send details, get a quote, we seal, guaranteed.

  • Sealant lifting along a tray edge
  • Gaps where vanity tops meet the wall
  • Users noticing mouldy joints
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
A fixed quote for the work, with the scope in writing.
3
We seal
Failed joints cut out, faces prepared, new sealant laid.
4
Guaranteed
12-month guarantee on our workmanship.
South East, London & Scotland
CHAS & Constructionline
£5m PL insurance

Need washroom sealing in Forest Hill?

Photos, a specification or a quick description of the joints is enough to start a fixed quote.

Washroom sealing in Forest Hill

Our washroom work covers offices, hotels, schools and colleges, leisure centres and gyms, clinics and care homes, along with staff kitchens and tea points. The products and the method are chosen for how heavily each space is used. We work on urinals and WCs, kitchens and tea points and showers, trays and wet room floors, and the usual reasons a site gets in touch are failed sealant in a tea point or staff kitchen and sealant stained black around basins and showers. Sealant contractors, mastic applicators, sealant specialists: whatever the job title on the order, in Forest Hill it comes down to the same thing: failed joints cut out, faces prepared and the right sealant laid to the right depth.

Many London buildings can’t close every toilet at once. We work through washrooms floor by floor or core by core, at times agreed with you.

Every job we finish is backed by a 12-month workmanship guarantee, wherever the site is. If a joint we sealed fails because of how it was installed, we come back and put it right.

Location
Forest Hill (SE23, SE22, SE26)
Region
Greater London
Guarantee
12 months on our workmanship
Price
A fixed quote before we start
Telephone
01277 525 020
Updated
3 November 2026
The Mastic Doctor team beside their liveried vans in front of an office building

Why act early in Forest Hill

Sealing on top of old silicone saves nothing. Silicone won’t grip silicone, so it lifts and holds moisture underneath. Cutting out completely and cleaning back takes a little longer and lasts. In a London building, a failed joint rarely affects only one party. Dealing with it early is simpler for everyone.

No two sites price the same: the joint sizes, the specified product, access and working hours each have a bearing. Send the details and a fixed figure follows.

Why appoint us

  • Colour agreed before work starts
  • 12 months’ guarantee on every job
  • CSCS-carded applicators
  • One contact handling all your sites

Read our cost guide or how we’re accredited.

When to call us in Forest Hill

Warmth, moisture and soap residue are exactly what mould needs, and silicone joints hold onto all three. Even anti-mould grades can be colonised over time where extraction is poor.

Most enquiries start with one or more of the following:

  • Washrooms that look worn because of the sealant
  • Failed joints along IPS and cubicle panels
  • A new bead over an old one coming away
  • Open joints along basins and vanity units

Toilets at colleges like Christ the King: Aquinas Sixth Form College (to the north of Forest Hill) take heavy use from students and staff alike.

What to look for in a quote

  • Is the sealant right for the movement and the substrate?
  • How the existing material will be dealt with
  • What the guarantee covers, and for how long
  • Health and safety accreditation such as CHAS

Choosing a commercial sealant contractor

Sanitary sealant for Forest Hill buildings

Two care or nursing homes sit less than 2 miles from Forest Hill. Care home wet rooms and en suites are used every day and cleaned hard, which tells on the silicone. We plan the work with the manager so residents are disturbed as little as possible. There are several hotels within about 2 miles of Forest Hill. Hotel en suites take daily use, and tired silicone at trays and basins is one of the first things guests notice. The work can go floor by floor, agreed with housekeeping.

Healthcare washrooms on sites such as University Hospital Lewisham (to the east of Forest Hill) are resealed area by area, under the site’s own infection-control rules. For a hall at a building such as Honor Oak Christian Fellowship Centre, resealing the kitchen and toilets can be fitted between bookings.

Forest Hill is about 2 miles south-east of East Dulwich, in Greater London. Commercial clients in Forest Hill use us for work on washrooms and wet areas, as part of our coverage of Greater London. We work across 764 places in Greater London, from busy centres to rural villages.

Postcode districts covered here: SE23, SE22 and SE26 for washrooms and wet areas. If your site is on Ewart Road, London Road and Rojack Road or close by, send details and we’ll quote for washrooms and wet areas. Nearby places we also cover include Honor Oak (1 mile north), Perry Vale (1 mile south-east), Brockley (1 mile north-east), Crofton Park (1 mile north-east) and Dulwich (1 mile west). A short drive away, we cover London (4 miles north-west), City of Westminster (6 miles north-west), Marylebone (6 miles north-west), Kensington (7 miles north-west), St Pancras (6 miles north-west) and Shoreditch (6 miles north).

Near you in Forest Hill

Recent enquiries here include premises near Allenby Tutorial Trust, Capitol Cinema pub and Harris Girls' Academy East Dulwich, among other places. Forest Hill’s nearest station is Honor Oak Park station, about 0.5 miles north-east of the centre. Well-known places in the area include Greenwich Castle (3.1 miles north-east) and Horniman Museum and Gardens (0.5 miles south-west). Green spaces nearby include One Tree Hill and Knight's Hill.

Map of Forest Hill © OpenStreetMap contributors

How the quote is worked out

Before we quote, we look at:

  • The product specified
  • How much there is to seal
  • Travel to remote or island sites
  • Any access equipment needed

There’s no price list, because the scope varies so much from one building to the next. Call for a quote.

What we need to price the job

We can often quote from photographs and a few details. It helps to include:

  • Your programme or deadline
  • Any specification or named product
  • The type of building and who uses it
  • Photos of the joints, close up and from further back

The quickest route to a quote is a few photos and the site postcode. Upload them with the quote form, or give us a call on 01277 525 020 or email the details over if you’d rather talk the job through.

Looking after the joints

Every sealant joint needs some looking after, and their life depends on movement, exposure, cleaning and use. We suggest:

  • Mention any site permits or estates rules at quote stage
  • Note failing joints building by building
  • Leave signs up until the cure time is over
  • Make sure washroom ventilation is running

Mild cleaning products and non-abrasive cloths look after sanitary silicone best. Aggressive descalers, solvents and scouring pads shorten its life and give mould a start.

Inspectors look at whether kitchen surfaces can be kept clean. Resealing sinks, worktops and splashbacks before an inspection is a simple step.

Work for main contractors and building owners

We take on planned maintenance as well as one-off repairs: working through a building or an estate in stages that fit your budget. Forest Hill can form part of a wider programme across Greater London.

Facilities managers want contractors who arrive with the paperwork sorted. Tell us what site paperwork you need, such as RAMS, an insurance certificate or CSCS details, and we will confirm with the quote.

Questions about Forest Hill

Can you work in a care home near Forest Hill with residents in?

Yes. Care settings are planned area by area, at times agreed with the home. Tell us about any infection-control or safeguarding requirements and we’ll work to them.

Do you work in London buildings with loading restrictions?

Yes. Booked loading bays, goods lifts and permit-to-work systems are normal for London jobs. Share the building’s contractor rules and we will work to them. We allow for the ULEZ, which covers every borough

Can weather delay the job?

Outside, yes. Sealant needs a dry joint and a temperature within the product’s range, so damp, frosty or very cold days can stop external work. Inside work is seldom held up.

When is resealing likely to be due?

There isn’t a single answer, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular inspection is the best way to catch problems early.

Do your applicators hold CSCS cards?

Yes. Our applicators hold CSCS cards, as many construction sites ask for.

Is old silicone taken out first?

The failed bead is always removed. Fresh silicone can’t key to an old bead, so sealing over it soon peels.

What about RAMS and site documents?

Each site asks for different documents, so tell us what you need and we will confirm it when we quote.

On site: what to expect

We follow your site rules from the start: sign-in, induction and whatever permit system the building uses. With the paperwork done, the joints are worked through in the order agreed with your site contact, and each area is checked before we leave it. All of Greater London is in the ULEZ, and kerbside space in Forest Hill can be scarce. Let us know about any on-site parking or loading arrangements when you send the job details.

  1. First, the phasing is agreed so facilities stay open.
  2. Anything behind the joints that needs another trade is flagged.
  3. Failed sealant and residue are stripped out.
  4. We reseal with the grade suited to each area.
  5. We confirm reopening times for each washroom.

Getting the site ready

  • Have the specification and drawings to hand
  • Clear stock, furniture or equipment away from the joints
  • Tell staff and tenants when we will be in

Get a fixed quote

Need a figure for a tender or a budget? We’ll quote against your scope and drawings you can plan around. For a chat about it beforehand, call 01277 525 020 or use the quote form.

Ask for a quote

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